Attachment plug receptacle



fjifr 11 ED 1 s Patented yJun@ 16, 1931 -V efrrsfrnnnv JJoi-rNsoN AND ARTHUR A. JOHNSON, OFNEW iannnonn, MAssAeHUs'ETTs,

`nssIeNoRsToiToHN I. PAULDTNG, ING., or Nnvv( Bnnromi, MASSACHUSETTS, A con "l `:2901111311oNfoF "MAssncjnirsnTTsy L ATTACHMENT PLUG 4RECEPTfrcLE 1 I Application filed July 14,

i This invention,relates` to =an attachment plug receptacle vand more especially .to a duplexlreceptacle vof that type adapted to be mounted in` the lHoor or Wal surface thereof. Y Thegeneral object of the invention is to provide a receptacle ofthe character del flush` ,With the e scribed Which isextremelysimple'and compact in construction with a. minimumnum- `ber of. parts, which 1s eiclent :and durable inI operation and. Whlch lmay be made vand 'assembled at very low cost ofl construction.

' Anotherobject `ofthe invention is. the

-provisionof ak one-piece receptacle iWhich,

With -theafeXception 0'-the ordinary faceplate;.isco1nplete and ready for. installation.

,1 .A vifurther object is the provision of arevceptacle'of shallow construction to facilitate mounting in thin partitions or shallow re- 'cesses.:l 1,. M l v `Other objects of theinvention Willl be'more .speciically set lfortl1,\and described hereinafter.

A. In.the.drawingsillustrating theki preferred .-form ot the invention, Figure 1 is a plan ViewV Y o-f-a receptaclejconstructed in accordance With soy .our invention; Fig.v 2=is ,a longitudinal vertical sectional View ofthesame online 2 2 in Fig.

.1g-Fig. y3i's a reversed plan vieWLWith certain .y f parts broken away;l to. shovvfthe interior lconistructiongFig. 4 isan end elevation of the receptacle 'showing-the construction of the 5 means for mounting `the 2 receptacle; Fig; 5 -f y E oiemountingconstruction; Fig. Gisa plan- ...view oftheba'ck face `of oneend of the re- *Y ceptaclefillustrating another modification of is-.a similanview `showing a modified form themounting means; Fig.;7 is a detailed sectional View of said mo'dilied formof `mounty ingmeansshown in Fig. 6=and Fig. 8 is af detail sectional View ofthecontactvplate fastening means.-A

vReferring to the illustrated embodiment-of s the invention, 10 designates 2L` .one-piece body yor ,block of insulating material having on its y; outenfacetwo, circular bosses .1 2 projecting v. slightlyf`ifromlsaid lface 'and fitting W1thin -circularopenin'gs in the face-plate 14 when the. tempt-ade; ris permanentlymounted inisa?. ./seriai Na1211531111.y

position. On its inner or back face the body 1 0 isvrecessed at 16 andy openinginto said recess `froml theouter face are two sets'of slots oropenings 18 and 19 for receiving the jack-blades Lofvtvvvopelectric plugs simultaneously. As shown each,r set comprises'y four such openings in eachboss, two of said openings 18 to accommodate plugs having blades arranged in ytandem and the othertwo 19 to take blades arranged'in parallelism.- l

. On the back face ofthe body 1.0 and kwithin the recess 16 are mounted two contactplates end. of each contact is bent over in reverse direction so thatwhen't isinserted in its respective slot *the freeend of. the contact is forcedfinvvardly soithat the contact engages both sidesk of the slot at all times and thereby insures agoodcontafvwhen the ,blade yof the .electric plugl isinsertedbetWeen the `free end fof,thecontactfandtheside of the slot; c, r

To afford suiicient room for theinsertion of thecontact 22 and atthe same time topre-` ven-t` the ack-blade entering on the` Wrong side of .the contact, each jackblade slot'is en- PTENTT "OFFICE-j f larged at its recessl end and ashoulder 231s thereby formed under vWhichthe bent portion of the Contact lifes'v (Fig. 2). Thefree end of each contact .may have the usual projecting boss 25for engaging a corresponding depression inthe j ack-,blade in engagement there-v` with so that the force required to .eiect a separation insures aquiclrwithdrawal ofthe jack-blade and prevents arcing.y 1 p The `tvvo contact-plates 20 are each heldin ixedseparated position upon the rearface of p the body byja terminal` screvv 24; passingv through thebody 10 andhaving itszshankend fthreadedinto a terminal lplate 26 mounted on a recessedshelf 28 formedin gthetop face of the body. kLbinding screw y3() is carried vby eachfof said' terminalplates for connect-` ing,an,electric Vsupply Vconductorv and each plate is provided` with an upturned lug 32 forholding theendgof the conductor'under detail. Y Y

the binding screw. The heads of the terminal screws 24 should be flush with the outer surfaces of the terminal plates and to accomplish this result, the holes in the body or receiving the terminal screws 24 are bevelled on the inner face of the body to receive the countersunk material surrounding the hole inthe terminal plate as show-n Figure 8 in For insulating the contacts, we provide a sheet or plate 34 of insulating materia-l cut to fit the recess 16 which may be fastened within` said recess by anyY suitable means. Preferably, however, it is held in position byscrews arranged centrally and at both ends bythe means used for mounting the receptacle in permanent position. Since the heads'of the terminal screws 24 are countersunk in the terminal plates as shownlin Figure 8 the sheet or plate 84 engages the contact plates; Each end of the insulating plate 34v is held in place by an end bracket 42 mounted on one end of the body and locked againstrlateralv or Vertical movement, said bracket having its upper i end turned outwardlyand providedwith a lhole`45 to permit Yfastening to a support and its lower end turned inwardly to secure the end of' the insulating plate in position. The 'body portionof each'bracket 42 is provided with two side ears 44 and that portion of the bracket with'the ears is set in a correspondingly shaped recess in the end of theV bodyv whereby, so long as thebracket :is in engage- 'ment with the body l0, it is locked'against vertical and lateral movement, thereon. YThe lower end of each bracket 42 is turned under Aone end of theinsulating plate 34 and that portionof 'the bracket is extendedon yboth sides, each extension Gfbeing turned upwardly through an' vopen slot in the perforati'ng plate and bent over uponV the inner face of said plate (Fig. 4) The two brackets are by this construction locked onthe two ends of the V`body and whenthe receptacle is permanently Vmounted, the brackets support thebody and 'the two endsiof the insulating'plate.

In Fig.v 5,a modified form of interlocking means is shown in which the bodyportionv 'of the bracket 47 is provided witha vertical opening adapted to receive a projecting boss 48'forn1ed on the end of the body 10 thereby locking the bracketagai'nst Vertical 'and lat-,

"eral'movem'ent when` in iinalA position. Vln Figs and 7 another modication of bracket is shown in which the bottom portion thereof lies in one plane and is secured to one end of the perforating plate 34 Vby screws 50 or other 'suitablejattaching ymeans such as eyelets or rivets. j, In this last modification, the flower portion of :the bracket 46 is extended la'terallytheV entire width of the insulating plate'and thereby serves to hold it in fixed` position when the receptacle is permanently mounted.

`It will be observed tha-tithe receptacle is of extreme simplicity of construction and that all unnecessary screws and other parts have been eliminated thereby conducing to economy of manufacture which is a consideration of great importance inl devices of this char- 7o acter. l Y

Although we have shown our invention as embodied, in a receptacle having two pairs of contactV slots or openings to accommodate plugs with tandem and parallel blades,it is to be understood that this form o the invention is merely illustrative and that the invention may be embodied in either single receptacles with but'one pair of contact slots or in duplex receptacles adapted to receive simultaneously a plurality of plugs.

What we claim is: n l. A-n attachment plug receptacle comprisying a one-'piece insulating body recessed in its inner face, a plurality of pairs nof Ijac'k-'bladef'g5 slots entering said recess from the outer face of said body, a pair "of contact plates mounted in said recess, each contact having-each of its two ends provided witha'pair of contacts projecting into two or said jack-blade 'slotsflao apair of terminal plates, a lpair of Screws,

Veach of said screws connecting one Aof said terminal plates with one of said contacts and serving to hold said terminal plateA and said Contact in .fastened position, a b5 sheet Vof 'insulating' material mounted within said 'recess and underlying said contacts, means for centrally fastening `said vinsulating sheet "to said body and means for mounting said receptacle in permanent R00 position, said mountingmeans being adapted lto'serve as means for holding V.the two ends of said insulating sheet 1in locked position Y within said recess.

` 2. An attachment plug receptaclefcompris-i' :105

fing a one-piece insulating body recessed `in its inner face, a plurality of pairs of jackblade slots entering said recess from 4the outer face of said'body, 'a Vpair *of contact n plates, leach plate `having'a plurality of pairs 311e Aoit-contacts projecting into saidslots, a pair of terminal plates, a screw connecting each of said terminal plates. with its respective contact plate, and serving to hold its connected members in place, a sheet Vof insulating material mounted on the inner faceof vsaid body and underlying said contact plates and a pair of brackets for mounting said receptacle in permanent position, vsaid bracketsbei-ng adapted by interlocking therewith to hold the ends of the Vinsulating material `locked on said body. l

of said receptacle; each of said brackets being interlocked to one end of said body and having a portion supporting one end of said insulating plate.

4. An attachment plug receptacle comprisinga one-piece linsulating body recessed in its back or inner face and provided With jackblade f slots, contact plates mounted Within 1.0 said recess and having contact portions projecting into said slots, a sheet of insulation underlying said contact plates and centrally secured to said body andrtvvo bracketsfor supporting said receptacle in permanent position mounted one on each end thereof; said bodyy and each of said brackets being provided WithV interlocking means .preventing vertical and lateral movement of said bracket on said body and each of said brackets hav- .20 ing a portion for supporting one end of said insulating plate Within said recess.

5. An attachment plug receptacle compris- 'ing acne-piece insulatingbody with jackblade slots, contact plates secured to the inner permanent position mounted one on each end face of said `body and having contact portions projecting into said slots, a sheet of insulation underlying said contact plates and two brackets for supporting said receptacle in permanent position mounted one on each end 3o of said receptacle, each of said brackets inter-A locking with one end of said sheet of insulation toy hold the same locked on said receptacle. y Y In Witness whereof, We have hereuntol set our hands this eleventh day of J 111551927 GUSTAF A. JOHNSON. ARTHUR A. JOHNSON. 

